What is the working principle of a car refrigerator?

[DiTyler]

Car refrigerators operate based on electronic chip cooling, utilizing PN junctions formed by special semiconductor materials to create thermocouple pairs, thereby generating the Peltier effect—a novel cooling method that achieves refrigeration through direct current, with a cooling temperature range of 5 to 65 degrees. Compressor car refrigerators, on the other hand, rely on traditional refrigerator technology, offering lower cooling temperatures ranging from -18 to 10 degrees. A car refrigerator refers to a portable cooling device that can be carried in a vehicle. There are primarily two types: semiconductor car refrigerators and compressor car refrigerators. The latter provides lower cooling temperatures, higher cooling efficiency, the ability to make ice and preserve freshness, and a larger size.